Burner



T. E. POTTS Feb. s, 1938.

BURNER Filed March 31, 1936 Al Euro?- Patented Feb. 8, 1938 UNITEDSTATES PATENT OFFICE Application March 31,

3 Claims.

This invention relates to devices in which liquid fuels as well as gasescan be burned.

One of the objects of this invention is to provide a burner of this typeso designed that the air supply can be controlled at the very point atwhich the fuel is brought to a state of ignition and so that anintermixing of air with fuel is forced at this point.

Another object is to provide for a circulation of the products ofcombustion inside and outside about. the whole burner.

Another object is to provide for a convenient observation of the burner.

Another object is to provide for a convenient regulation of the burnerunder a close observation.

Other objects will appear from the following description and appendedclaims as well as from the accompanying drawing, in which- 20 Fig. 1 isa perspective view of the complete burner, though without fuelconnections and controls.

Fig. 2 is a top plan view of the lower pan. Fig. 3 is a verticallongitudinal midsectional view of the burner with the topcombustioncontrol and front air control in proper position.

Fig. 4 is a vertical section on line 4-4 of Fig. 3.

Fig. 5 is a vertical section on line 5-5 of Fig. 2.

This burner is especially designed for small heating plants, even,particularly, for such small devices as so-called air-tight heaters.

The illustrations of Figs. 1 and 2, by means of the flanges 6, make itclear to what extent this burner is outside or inside of a heatingplant, the whole control parts being outside and the combustion partsbeing inside of such plants.

Having already stated that liquid as well as gas fuel is to be used withthis burner, there are, in the first place, the supply connection 8 forthe liquid fuel and the connection 1 for the gas fuel, secondly, thecontrol valve 9, but, furthermore, the air control means for thecombined burner, consisting of the top plate I, extending to the outsideand covering that whole portion over the top of the burner that is infront of the flanges 6, and the inwardly extending portion I2, by whichthe air supply can be controlled and checked, the whole air controlmeans being handled by the lug II on the top portion to to be adjustedwith respect to the inside combustion chamber.

The inwardly extending portion l3 of the main pan serves as a mixing andcombustion chamber. In Fig. 3, for instance, the portion l2 of the aircontrol means forms some sort of a baf- 1936, Serial No. 71,853

he by which the inrushing air is checked and deflected downwardly tointermix with the fuel normally injected near the bottom of the main panbelow the lower edge (4 of the bafiie, this edge being designed and soarranged that it will come in close proximity of the surfaces 15 of theraised bottom portions H3 in the position in which the baffle checks theinrushing of the air. in the extreme, being the position in which theair control is withdrawn to the outermos position within the main pan.

There is a central channel I! below the surface l5, and this channel iseven reduced at the most critical point, at which the leanest mixture ofair and fuel is to be produced, by additional raised portions IE to forma still smaller central channel l9, as will be more clearly understoodfrom the illustration in Fig. 3 taken together with the illustration ofFig. 5.

With this setting of the baffle I2, the combustion chamber extends thenfrom the baffle rearwardly to the rear wall 20 of the main pan, andcrosswise between the side walls 2 I.

This setting also limits the passage for the combined air and fuel thatenters the combustion chamber to the reduced cross section of thiscentral channel.

Considering then the illustration of Fig. 2, it will at once becomeevident that, by an inward shifting or adjustment of the air controlmeans in the direction towards the rear wall 20 of the main pan, thearea of the central passage is gradually increased from the very pointat which the cross section 55 is taken as the edge M of the baflie l2passes over the raised portions It, being beveled oif towards the rear,as indicated at 22, in such a manner as to give this result as will beunderstood.

The air control member is for this reason mounted in the upper edge ofthe side walls in suitably shaped recessed shoulders, indicated at 23 inFig. 2, and from the illustration in Fig. 3 it must be clear that thetop plate 10 is sufficiently shorter than the recessed shoulder 23 tofacilitate such a shifting and adjustment of the air control member inand to a limited extent, but so that a sufficient amount of air can beadmitted for a proper and desired mixture of different fuel and for thedifferent intensities at times required in a burner.

A heat distributing member 24 is provided in a certain relation to thecombustion chamber, as illustrated in Figs. 1, 3 and 4.

This distributing and circulating member 24 is provided with top baffles21 and side baffles 28, having lugs 25 and 26 suitably disposed tosupport the member 24 so that the top baffles become spaced above thetop edge and the side baffles become spaced beyond the outside faces ofthe side Walls 2| of the rearwardly extending combustion chamber, insuch a manner that a circulation and distribution of the products ofcombustion and therewith of heat may be had partly through the top inthe direction of the arrows 3i? and partly in the directions of thearrows 29, suitably around the outside of the combustion chamber, tofacilitate a superheating of the fuel in the combustion chamber.

It must be understood that, the flanges '27! and 28 may be wider ornarrower, to suit different conditions, due to different locations andfuels.

I claim:

1. In a burner, a main pan having connections for discharging liquid andgas fuels into the pan, an air control member shiftably mounted in thepan and embodying atop portion designed to close off the top of thefront portion of the pan and a bafile portion extending downwardly,between said connections and rearmost portion of the pan leaving a.space above the bottom of the pan so that fuel and air can pass belowthe bailie into said rearmost portion, the pan having a bottom portionwithrearwardly spreading shoulders so that various amounts of air canpass under the bafiie when shifted towards the rearmost portion. 7

2. In a burner, a main pan having connections for discharging liquid andgas fuels into the pan, an air control member adjustably mounted on thepan shiftable from front to rear, the pan haw'ng a bottom portion withrearwardly spreading shoulders to allow various amounts of air to passfrom the front towards the rear under the air control member, and a heatdistributing member disposed overrthe rear portion of the pan havingflange-like portions over the top leaving an open discharge space overthe top of the pan and being spaced above the top edge of the pan andwith flange-like portions extending downwardly" from the first-namedflangelike portions and being spaced laterally from the panforcirculating a part of the products of combustion around the pan forheating the fuel in the pan.

3. In a burner, a main pan having connections for liquid and gas fuels,an air control member embodying atop plate and a baffle portion, the panhaving a bottom-portion with a top surface and fuel passing means ofvarying cross-sectional areas extending below such surface, the panhaving also means in its top portion for shiftably supporting themember'so that the baiile and bottom portion form an'outlet fuel and airpassage of varying cross-sectional areas as the baffie is shifted backand forth; v

THOMAS E. roT'rs.

